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Patreon will have to use Apple's in-app purchase system or be removed from the App Store
(www.engadget.com)
This is a most excellent place for technology news and articles.
Yes, that's exactly what they're doing. If you have a Patreon, you must choose between increasing patreon price on Apple specifically compared to Android and Web, or you can keep the price the same, in which case you will earn less from users using iOS in-app purchase